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- W2030759735 abstract "We present a measurement of the fraction f+ of right-handed W bosons produced in top quark decays, based on a candidate sample of tt¯ events in the ℓ+jets and dilepton decay channels corresponding to an integrated luminosity of 370 pb−1 collected by the D0 detector at the Fermilab Tevatron pp¯ Collider at s=1.96 TeV. We reconstruct the decay angle θ* for each lepton. By comparing the cosθ* distribution from the data with that for the expected background and signal for various values of f+ (where we assume that the fraction of longitudinally-polarized W bosons has the standard model value of 0.70), we find f+=0.056±0.080(stat)±0.057(syst) (f+<0.23 at 95% C.L.), consistent with the standard model prediction of f+=3.6×10−4.Received 26 September 2006DOI:https://doi.org/10.1103/PhysRevD.75.031102©2007 American Physical Society" @default.
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